Confidence high in Bloodhound land speed record team

The British-built straight-line racer recorded its highest speed yet during a hot afternoon run across the Kalahari Desert on Wednesday.

GPS instruments in the vehicle clocked 501mph (806km/h).

Bloodhound's driver, Andy Green, declared himself "chuffed to bits" after bringing the car to a stop.

His team is now increasingly confident it has the means to break the land speed record of 763mph (1,228km/h)...

Confidence high in Bloodhound land speed record team

By Jonathan Amos BBC Science Correspondent, Hakskeen Pan, South Africa 6 November 2019

The British-built straight-line racer recorded its highest speed yet during a hot afternoon run across the Kalahari Desert on Wednesday.

GPS instruments in the vehicle clocked 501mph (806km/h).

Bloodhound's driver, Andy Green, declared himself "chuffed to bits" after bringing the car to a stop.

His team is now increasingly confident it has the means to break the land speed record of 763mph (1,228km/h).

That won't happen for at least a year. More testing is needed, as is more thrust, which will come from the addition of a rocket motor.

At the moment, Bloodhound is powered by a jet engine from a Eurofighter-Typhoon. The trials here on South Africa's Hakskeen Pan will determine just how big a boost that rocket must deliver.

"When you see Bloodhound go off the start line, it flies. And that's with only nine tonnes of thrust from the jet. For the land speed record, we could have another five, six tonnes on top of that from the rocket," explained chief engineer Mark Chapman.

The car clocked 491mph (790km/h) on Tuesday; and had done 461mph (742km/h) last Friday. It's been going faster and faster on every outing, enabling the team to explore the handling and stability of the arrow-shaped vehicle.

But while the top speeds are eye-catching, the team is just as concerned to understand how to stop Bloodhound... safely.

It's no good breaking the land speed record if you can't then bring the car to a halt inside the length of a track, even one as stretched out as Hakskeen's at 10 miles (16km).

That's why a key ambition on Wednesday was to investigate brake chutes.

Bloodhound has two of these, which pop out from the back of the car from two canisters positioned just under the jet's exhaust nozzle.

They act to slow the vehicle as it comes down through the speed range at 500mph and 400mph.

Andy Green inspects one of the brake chutes after the 501mph run

When a chute was tried a week ago, it jumped around in the airflow behind Bloodhound, making the car twitch out of shape, which Andy Green then had to correct with his steering.

But the chute was subsequently modified to increase its porosity by cutting open some of its panels.

"It came out, bang! Absolutely solid this time," said Wing Commander Green. "The second chute then came out at a hundred miles an hour slower - I could feel it moving around. But it will be an easy 'mod'. It takes 10 minutes with a pair of scissors," he told BBC News.

The team has been presented with various technical niggles along its learning curve.

One tricky problem has been the damage inflicted on the bodywork by the fast stream of air and dust passing over the rear suspension. This forceful flow has been lifting and bending metalwork.

The patch repairs implemented following Tuesday's run looked untouched after Wednesday's drive, indicating that engineers probably now have a long-term solution.

There was a moment at the end of the run when the team thought it might have a fire

But they will be wary of the unexpected. And there was a taste of this right at the end of the latest run.

Andy Green could be heard calling out "fire, fire, fire" over the radio. A sensor system had detected anomalously high temperatures in the jet engine bay.

As the RAF pilot climbed from Bloodhound, rescue vehicles were already on the scene. But no fire was discovered. It's likely the extreme desert heat - upwards of 37C - had tripped the sensor system.

"It was very hot out there today and maybe on another occasion we wouldn't have gone out. But we have to take every opportunity that's given to us," said Stuart Edmondson, Bloodhound's head of engineering operations.

Bloodhound's next outing is likely to be on Friday.

The run could see a speed of 550mph (885km/h) being posted. Certainly, the modelling suggests the current set-up ought to be capable of getting above 600mph (965km/h).

But Mark Chapman says the data streaming from the multiple sensors inside the vehicle is his main priority.

"This car has lived in a virtual environment for the last 10 years or so. Here at Hakskeen Pan, Bloodhound's behaviour is helping us to validate all the modelling that went into its design."

The current land speed record of 763mph (1,228km/h) was set in 1997, also by Wing Commander Green.

In doing so, he also became the first person in history to take a wheeled vehicle beyond Mach 1, the speed of sound.

The speeds posted here by Bloodhound make it the third fastest British car of all time, behind Thrust2, which broke the land speed record in 1983; and Andy Green's 1997 car, Thrust SSC.

This is a team that feels it has a record-breaking strategy and car
Bloodhound land speed racer blasts to 628mph

By Jonathan Amos
BBC Science Correspondent
16 November 2019

Bloodhound has now joined the exclusive club of land speed racers that have gone faster than 600mph (965km/h).

Running across its dry lakebed track on Saturday, the British car's GPS sensors clocked 628mph (1,010km/h).

Only six vehicles in the history of the land speed record have previously driven beyond 600mph.

Bloodhound's achievement is notable because it's been running with only the thrust of a jet engine. The car's design allows for a rocket motor, too.

When this is fitted next year, as planned, the arrow-shaped machine should be in a very strong position to smash the current world record of 763mph (1,228km/h).

This was set 22 years ago by another British car, Thrust SSC. The driver back then was the same as in Bloodhound today - RAF pilot Andy Green.

"The stability and confidence [Bloodhound] gives me as a driver is testament to the years of world class engineering that has been invested in her by team members past and present," he said.

"With all the data generated by reaching 628mph, we're in a great position to focus on setting a new world land speed record in the next year or so."

Bloodhound has been conducting its high-speed trials in South Africa's Northern Cape - on Hakskeen Pan, a wide and extremely flat section of desert.

As on previous fast runs, Saturday's mark was set early in the morning. It's the time of day when air temperatures are at their coolest, enabling Bloodhound's Eurofighter jet to build its thrust very rapidly.

To put the 628mph in some sort of context - that's faster than an airliner would typically be cruising, and Bloodhound is doing it at ground level. And a fighter plane tearing down a runway would be airborne long before it approached this kind of speed.

Sensors on Bloodhound revealed the airflow beneath the car went supersonic during its run. Paintwork 3m back from the front wheels was stripped away.

The team says the 628mph speed concludes the high-speed trials and it will now return to England.

The six vehicles to have also raced above 600mph are Sonic 1, Blue Flame, Thrust2, Budweiser Rocket, Sonic Arrow, and Thrust SSC. Only Budweiser Rocket and Thrust SSC went beyond 700mph (1,126km/h).

Thrust SSC's all-time record was set in America's Black Rock Desert is 1997

Whether Bloodhound can eclipse them all is going to depend in large part on financing.

The car's costs are currently being underwritten by wealthy Yorkshire businessman Ian Warhurst. He says the next phase of the project will have to be funded by others, most likely corporate sponsors.

"Our speed objective for these tests was to reach 1,000km/h. Hitting 1,010km/h is a real milestone and shows just what the team and the car can achieve.

"With the high-speed testing phase concluded, we will now move our focus to identifying new sponsors and the investment needed to bring Bloodhound back out to Hakskeen Pan in the next 12 to 18 months' time.

"Not only am I immensely proud of the team, I'm also delighted that we've been able to demonstrate that the car is eminently capable of setting a new world land speed record."

The Norwegian aerospace company Nammo is waiting and willing to put one of its rockets in Bloodhound, and the car will need the booster if it wants to challenge Thrust SSC.

"As you get faster, the main force you're fighting against is the drag," Nammo's chief engineer Adrien Boiron told BBC News.

"The drag is proportional to the square of the speed, which means that it gets more and more of a problem. And the way for Bloodhound to get a lot faster than the previous car, which had two jet engines, is to have a rocket in it."
Last edited by Blackleaf; Nov 17th, 2019 at 02:11 PM..

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